*Excludes Observations that spanned multiple years

Pre 19702
19700
19712
19720
19730
19740
19750
19760
19770
19780
19790
19800
19811
19820
19830
19840
19851
19864
19874
198836
198917
19902
199123
199227
199323
19940
199525
199615
199730
19984
199916
20009
20011
200210
20031
20043
200510
20064
20072
20084
20096
20100
20113
20121
20132
20140
20150
20161
20171
20182
20194
20200
20210
Total296